UFC welterweight contender Stephen Thompson is currently sidelined after undergoing surgery to repair an injured knee.

Thompson suffered the injury during his win in July over Jake Ellenberger, according to a report on “UFC Tonight.”

After connecting with a spinning attack, Thompson was forced to put more pressure on his left leg to compensate for the injury to his right heel. That resulted in a meniscus tear and sent “Wonderboy” to the sidelines.

Following surgery earlier this month, Thompson’s dad, Ray, informed the program that his son is targeting a return in either December or January – and that he plans to be prepared if a short-notice opponent is needed.

The 32-year-old Thompson (11-1) has won five in a row since a decision loss to Matt Brown. That includes finishes of Ellenberger, Robert Whittaker and Chris Clements, along with a decision victory over former title contender Patrick Cote.